Guiding steam waste heat recycling device and energy-saving plant

Abstract

The invention discloses a guide spraying steam waste heat recycling device and an energy-saving plant, which can recycle steam heat energy discharged by an anti-freezing guide spraying device and reduce heat energy waste. The guide spraying steam waste heat recycling device comprises a heat pipe network, a packed tower and a circulating pump. And the heat pipe network is provided with a circulating water inlet and a circulating water return port. The middle part of the packed tower is communicated with the spray guide steam pipeline, the top of the packed tower is communicated with the circulating water return port, and the bottom of the packed tower is communicated with the circulating water inlet, so that a water body can circulate between the heat pipe network and the packed tower; and a packing layer is arranged in the packed tower and is positioned between the circulating water return port and the spray guide steam pipeline, so that steam entering from the spray guide steam pipeline passes through the packing layer to heat a water body entering from the circulating water return port. The circulating pump is arranged on a pipeline between the bottom of the packed tower and the circulating water inlet and is used for driving a water body to circulate between the packed tower and the heat pipe network.

Description

Technical Field

[0001] This invention relates to the field of steam waste heat recovery technology, and in particular to a device for recovering and utilizing waste heat from a drain steam system and an energy-saving factory building. Background Technology

[0002] In industrial production processes, various steam equipment and pipelines within factory buildings are typically equipped with antifreeze drainage systems to prevent freezing and cracking during winter. These systems intermittently supply steam to heat the equipment and pipelines.

[0003] The steam discharged from the antifreeze drainage device carries a large amount of heat. However, because the steam flow and temperature are unstable and the outlets are scattered, the industry has not paid much attention to this part of the steam. Most of the time, this drainage steam is directly discharged into the atmosphere, resulting in a waste of steam, especially during the steam warming stage, which causes serious heat energy waste and does not conform to the current development concept of energy conservation and emission reduction. On the other hand, the discharged steam may also cause thermal pollution to the surrounding environment and even noise interference. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art by providing a waste heat recovery and utilization device for the cooling steam and an energy-saving plant, which can recover and utilize the heat energy of the steam discharged from the antifreeze cooling device and reduce heat energy waste.

[0005] In a first aspect, embodiments of the present invention provide a waste heat recovery and utilization device for shower steam, comprising a heat-using pipe network, a packed tower, and a circulating pump. The heat-using pipe network has a circulating water inlet and a circulating water return outlet. The middle part of the packed tower is connected to the shower steam pipeline, the top of the packed tower is connected to the circulating water return outlet, and the bottom of the packed tower is connected to the circulating water inlet, so that water can circulate between the heat-using pipe network and the packed tower. A packing layer is provided inside the packed tower, located between the circulating water return outlet and the shower steam pipeline, so that steam entering from the shower steam pipeline passes through the packing layer to heat the water entering from the circulating water return outlet. The circulating pump is installed on the pipeline between the bottom of the packed tower and the circulating water inlet, and is used to drive the water to circulate between the packed tower and the heat-using pipe network.

[0006] In some embodiments, the waste heat recovery device for the exhaust steam further includes a control component. The control component includes a return pipeline, a first flow control valve, a first temperature sensor, a first on / off valve, and a controller. A first end of the return pipeline is connected to a pipeline between the circulating pump and the circulating water inlet, and a second end of the return pipeline is connected to the upper part of the packed tower and located above the packing layer. The first flow control valve is disposed on the return pipeline. The first temperature sensor is disposed at the bottom of the packed tower and is used to detect a first temperature of the water at the bottom of the packed tower. The first on / off valve is disposed on the pipeline between the first end of the return pipeline and the circulating water inlet. The controller is electrically connected to the first temperature sensor, the first flow control valve, and the first on / off valve, respectively, and is used to control the on / off state of the first on / off valve and the flow rate of the first flow control valve according to the first temperature and a first preset temperature.

[0007] In some embodiments, the heating network includes heating water pipelines and domestic water pipelines. The inlets of the heating water pipeline and the domestic water pipeline merge to form a circulating water inlet; the outlets of the heating water pipeline and the domestic water pipeline merge to form a circulating water return outlet. A second on / off valve and a first check valve are installed on the heating water pipeline, and a third on / off valve and a second check valve are installed on the domestic water pipeline.

[0008] In some embodiments, the control component further includes a second temperature sensor, a third temperature sensor, and a second flow control valve. The second temperature sensor is located at the inlet of the heating water pipeline and is used to detect a second temperature of the water at the inlet. The third temperature sensor is located at the water terminal of the domestic water pipeline and is used to detect a third temperature of the water at the water terminal. The second flow control valve is located on the shower steam pipeline. The controller is also electrically connected to the second temperature sensor, the third temperature sensor, and the second flow control valve, respectively, and is also used to control the flow rates of the first flow control valve and the second flow control valve based on a first temperature, a second temperature, a first preset temperature, and a second preset temperature, and to control the flow rates of the first flow control valve and the second flow control valve based on the first temperature, the third temperature, the first preset temperature, and the third preset temperature.

[0009] In some embodiments, the control component further includes a water supply pipe, a water supply valve, and a level sensor. One end of the water supply pipe is connected to an external water supply pipe, and the other end is connected to the interior of the packed tower. The water supply valve is installed on the water supply pipe. The level sensor is installed inside the packed tower and is used to detect the real-time water level inside the packed tower. The controller is also electrically connected to the water supply valve and the level sensor respectively, and is used to control the opening and closing of the water supply valve according to the real-time water level, a first preset water level, and a second preset water level.

[0010] In some embodiments, a liquid distributor is also provided inside the packed tower, and the liquid distributor is located at the top of the packed tower; the circulating water return port is connected to the inlet of the liquid distributor.

[0011] In some embodiments, a wire mesh mist eliminator is also provided inside the packed tower, and the wire mesh mist eliminator is located at the exhaust port at the top of the packed tower.

[0012] In some embodiments, a drain outlet is provided on the bottom wall of the packed tower.

[0013] In some embodiments, an insulation layer is provided on the outer wall of the packed tower.

[0014] Therefore, the waste heat recovery and utilization device for the drain steam provided in this embodiment of the invention, by setting up a heat supply network, a packed tower, and a circulating pump, connects the top of the packed tower to the circulating water return port of the heat supply network, and the bottom of the packed tower to the circulating water inlet of the heat supply network. The circulating pump is installed on the pipeline between the bottom of the packed tower and the circulating water inlet, driving water to circulate between the packed tower and the heat supply network. By connecting the middle of the packed tower to the drain steam pipeline, and setting a packing layer inside the packed tower, with the packing layer located between the circulating water return port and the drain steam pipeline, steam from the drain steam pipeline enters the packed tower and passes through the packing layer from bottom to top, heating the packing layer. Water from the heat supply network enters the packed tower through the circulating water return port and passes through the packing layer from top to bottom; it is heated by the packing layer and the steam entering the packed tower, thus absorbing heat from the steam in the drain steam pipeline through the water, achieving the recovery of steam heat energy from the drain steam pipeline. The water temperature rises after absorbing heat, and the absorbed heat energy is utilized by circulating it in the heat-using pipe network. This also realizes the recovery and utilization of the heat energy discharged from the shower steam pipe, which can reduce heat energy waste, reduce the energy costs of enterprises, and meet the policy requirements of energy conservation and emission reduction.

[0015] Secondly, embodiments of the present invention also provide an energy-saving factory building, which includes factory equipment, a steam drainage pipeline, and the waste heat recovery and utilization device for the steam drainage as described in the first aspect. The steam drainage pipeline is installed on the factory equipment and connected to a steam generator for heating the factory equipment with steam.

[0016] The energy-saving plant described above has the same beneficial technical effects as the waste heat recovery and utilization device for the guiding steam provided in some of the above embodiments, and will not be repeated here. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of this invention, the accompanying drawings used in some embodiments of this invention will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings. Furthermore, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this invention.

[0018] Figure 1 This is a structural diagram of a waste heat recovery and utilization device for a condenser steam system provided in an embodiment of the present invention.

[0019] Among them, 1-heating pipe network; 2-packed tower; 3-packing layer; 4-steam guide pipe; 5-circulating pump; 6-return pipe; 7-first flow control valve; 8-first on / off valve; 9-controller; 10-heating water pipeline; 11-domestic water pipeline; 12-second on / off valve; 13-third on / off valve; 14-second flow control valve; 15-liquid distributor; 16-wire mesh mist eliminator. Detailed Implementation

[0020] The technical solutions in some embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided by the present invention are within the scope of protection of the present invention.

[0021] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0022] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0023] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." Furthermore, the specific features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

[0024] In describing some embodiments, the term "connection" and its derivative expressions may be used. The term "connection" should be interpreted broadly; for example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. The embodiments of the invention described herein are not necessarily limited to the content of this document.

[0025] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are enlarged for clarity. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0026] Example 1: like Figure 1As shown in the figure, this embodiment of the invention provides a waste heat recovery and utilization device for drain steam. The waste heat recovery and utilization device for drain steam is applied in an industrial plant and is used to recover steam from the drain steam pipeline.

[0027] like Figure 1 As shown, the waste heat recovery and utilization device for the drain steam includes a heat supply network 1, a packed tower 2, and a circulating pump 5. The heat supply network 1 has a circulating water inlet and a circulating water return outlet. The middle part of the packed tower 2 is connected to the drain steam pipeline 4, the top of the packed tower 2 is connected to the circulating water return outlet, and the bottom of the packed tower 2 is connected to the circulating water inlet, so that the water can circulate between the heat supply network 1 and the packed tower 2. A packing layer 3 is provided inside the packed tower 2, located between the circulating water return outlet and the drain steam pipeline 4, so that the steam entering from the drain steam pipeline 4 passes through the packing layer 3 to heat the water entering from the circulating water return outlet. The circulating pump 5 is installed on the pipeline between the bottom of the packed tower 2 and the circulating water inlet, and is used to drive the water to circulate between the packed tower 2 and the heat supply network 1.

[0028] For example, the heat pipe network 1 can be the heating pipe network of an industrial plant. High-temperature water heated by the packed tower 2 enters the heat pipe network 1 from the circulating water inlet to heat the heat pipe network 1, and then flows back to the packed tower 2 from the circulating water return outlet.

[0029] For example, the water in the heat pipe network 1 can be the condensate from the steam in the steam distribution pipe 4, or it can include external water (e.g., domestic tap water) that is additionally supplied to the packed tower 2.

[0030] For example, the top of the packed tower 2 is provided with an exhaust port to discharge gas components in the steam.

[0031] For example, the volume of packed tower 2 can be 5m³. 3 The packed tower 2 is equipped with a supporting grid plate, and the packing layer 3 is placed on the supporting grid plate.

[0032] For example, the packing layer 3 is formed of multiple random-packed metal Pall rings.

[0033] For example, the circulating pump 5 can be a centrifugal pump with a head of 30m and a flow rate of 15m. 3 The centrifugal pump is made of stainless steel to prevent corrosion and extend its service life.

[0034] For example, the pipe diameter between the bottom of the packed tower 2 and the circulating water inlet is DN25.

[0035] Through the above setup, water can circulate between the packed tower 2 and the heat supply network 1. Steam from the drain steam pipe 4 enters the packed tower 2 and flows upwards through the packing layer 3, heating the packing layer. Water from the heat supply network 1 enters the packed tower 2 through the circulating water return inlet and flows downwards through the packing layer 3, thus being heated by the packing layer 3 and the steam entering the packed tower 2. This allows the water to absorb heat from the steam in the drain steam pipe 4, achieving the recovery of steam heat energy. The water temperature rises after absorbing heat, and by circulating in the heat supply network 1, the absorbed heat energy is utilized, thus recovering the heat energy discharged from the drain steam pipe 4. This reduces heat energy waste and eliminates the need for additional heating of the heat supply network 1, reducing the company's total energy costs and complying with energy conservation and emission reduction policies.

[0036] Furthermore, the waste heat recovery device for the shower steam provided in this embodiment of the invention has a simple structure and a small footprint. It can be flexibly arranged according to the size of the plant and water demand. It is not only suitable for large industrial plants, but also for the waste heat recovery needs of small and medium-sized enterprises, and has a wide range of applications.

[0037] Therefore, the waste heat recovery and utilization device for the guiding steam provided in this embodiment of the invention, by setting up a heat supply network 1, a packed tower 2 and a circulating pump 5, connects the top of the packed tower 2 to the circulating water return port of the heat supply network 1, and the bottom of the packed tower 2 to the circulating water inlet of the heat supply network 1. The circulating pump 5 is set on the pipeline between the bottom of the packed tower 2 and the circulating water inlet, and the circulating pump 5 can drive the water to circulate between the packed tower 2 and the heat supply network 1. By connecting the middle of the packed tower 2 to the steam distribution pipeline 4, and installing a packing layer 3 inside the packed tower 2, positioned between the circulating water return inlet and the steam distribution pipeline 4, steam from the steam distribution pipeline 4 enters the packed tower 2 and passes through the packing layer 3 from bottom to top, heating the packing layer. Water from the heat network 1 enters the packed tower 2 through the circulating water return inlet and passes through the packing layer 3 from top to bottom, where it is heated by the packing layer 3 and the steam entering the packed tower 2. This allows the water to absorb heat from the steam distribution pipeline 4, thus recovering the steam's thermal energy. The increased water temperature, combined with the heat absorbed through circulation within the heat network 1, enables the recovery and utilization of the heat energy discharged from the steam distribution pipeline 4. This reduces heat waste, lowers energy costs for enterprises, and aligns with energy conservation and emission reduction policies.

[0038] In some embodiments, such as Figure 1As shown, the waste heat recovery and utilization device for the exhaust steam also includes a control component. The control component includes a return pipeline 6, a first flow control valve 7, a first temperature sensor, a first on / off valve 8, and a controller 9. The first end of the return pipeline 6 is connected to the pipeline between the circulating pump 5 and the circulating water inlet, and the second end is connected to the upper part of the packed tower 2 and located above the packing layer 3. The first flow control valve 7 is installed on the return pipeline 6. The first temperature sensor is installed at the bottom of the packed tower 2 to detect the first temperature of the water at the bottom of the packed tower 2. The first on / off valve 8 is installed on the pipeline between the first end of the return pipeline 6 and the circulating water inlet. The controller 9 is electrically connected to the first temperature sensor, the first flow control valve 7, and the first on / off valve 8, respectively, and is used to control the on / off state of the first on / off valve 8 and the flow rate of the first flow control valve 7 according to the first temperature and a first preset temperature.

[0039] For example, the return line 6 is a stainless steel pipe with a diameter of DN25.

[0040] For example, the first temperature sensor is a PT100 platinum resistance thermometer. The first on / off valve 8 is a solenoid valve. The controller 9 is a programmable logic controller (PLC), which can be a Siemens S7-200 model.

[0041] For example, the first preset temperature can be set according to the site conditions and stored in the controller 9.

[0042] For example, the first preset temperature can be 85°C.

[0043] The control method of controller 9 is illustrated below: In the initial state, the first on / off valve 8 is open, and the first flow control valve 7 is open to 50%. At this time, the circulating pump 5 delivers a portion of the water to the heating network 1, and the other portion is delivered to the return pipeline 6 and then re-enters the packed tower 2 for reheating.

[0044] Combination Figure 1 When the first temperature of the water at the bottom of the packed tower 2 is less than 85℃ (first preset temperature), the controller 9 controls the first on / off valve 8 to close and increases the flow rate of the first flow control valve 7 (for example, adjusting the opening of the first flow control valve 7 to 80%). At this time, the water in the heat pipe network 1 no longer flows into the packed tower 2. All the water in the packed tower 2 circulates between the packed tower 2 and the return pipe 6, so that the water is heated a second time, increasing the heating rate of the water in the packed tower 2 and making the temperature of the water in the packed tower 2 rise as quickly as possible.

[0045] When the first temperature of the water at the bottom of the packed tower 2 is greater than or equal to 85℃ (first preset temperature), it indicates that the water in the packed tower 2 meets the preset external delivery conditions. The controller 9 controls the first on / off valve 8 to open and reduces the flow rate of the first flow control valve 7 (for example, adjusting the opening of the first flow control valve 7 to 50%). At this time, the circulating pump 5 delivers a portion of the water to the heating network 1 to meet the hot water demand of the heating network 1, and the other portion is delivered to the return pipeline 6 and then re-enters the packed tower 2 for secondary heating.

[0046] Understandably, the amount of steam delivered by the steam distribution pipeline 4 is unstable, and the heat carried by the steam is also unstable, resulting in an unstable heating rate of the water in the packed tower 2. The above settings ensure that the temperature of the water output from the packed tower 2 meets the preset requirements, avoiding or reducing temperature fluctuations in the water delivered to the heat supply network 1 due to the unstable heating rate of the water in the packed tower 2 caused by the steam distribution pipeline 4.

[0047] In some embodiments, such as Figure 1 As shown, the heating network 1 includes a heating water pipeline 10 and a domestic water pipeline 11. The inlets of the heating water pipeline 10 and the domestic water pipeline 11 merge to form a circulating water inlet; the outlets of the heating water pipeline 10 and the domestic water pipeline 11 merge to form a circulating water return outlet. A second on / off valve 12 and a first check valve are installed on the heating water pipeline 10, and a third on / off valve 13 and a second check valve are installed on the domestic water pipeline 11.

[0048] For example, the heating water pipeline 10 includes a first connecting pipe and a radiator assembly for heating the plant.

[0049] For example, the domestic water pipeline 11 includes a second connecting pipe and a domestic water terminal (such as a workshop faucet, dormitory faucet, etc.).

[0050] For example, the second on / off valve 12 and the third on / off valve 13 can be manual valves or solenoid valves. By adjusting the on / off state of the second on / off valve 12 and the third on / off valve 13, the supply of water from the packed tower 2 to the heating water pipeline 10 or to the domestic water pipeline 11 can be switched.

[0051] For example, when heating is needed in winter, the second shut-off valve 12 can be opened and the third shut-off valve 13 can be closed; when heating is not needed, the second shut-off valve 12 can be closed and the third shut-off valve 13 can be opened.

[0052] like Figure 1 As shown, when both the second on / off valve 12 and the third on / off valve 13 are solenoid valves, both the second on / off valve 12 and the third on / off valve 13 can be electrically connected to the controller 9 so that the controller 9 can remotely control the on / off state of the second on / off valve 12 and the third on / off valve 13.

[0053] With the above settings, the packed tower 2 can be switched to supply water to the heating water pipeline 10 or to the domestic water pipeline 11, and backflow between the heating water pipeline 10 and the domestic water pipeline 11 can be avoided.

[0054] In some embodiments, such as Figure 1 As shown, the control assembly also includes a second temperature sensor, a third temperature sensor, and a second flow control valve 14. The second temperature sensor is installed at the inlet of the heating water pipeline 10 to detect the second temperature of the water at the inlet of the heating water pipeline 10. The third temperature sensor is installed at the water terminal of the domestic water pipeline 11 to detect the third temperature of the water at the water terminal. The second flow control valve 14 is installed on the steam shower pipeline 4. The controller 9 is also electrically connected to the second temperature sensor, the third temperature sensor, and the second flow control valve 14 respectively, and is also used to control the flow rates of the first flow control valve 7 and the second flow control valve 14 according to the first temperature, the second temperature, the first preset temperature, and the second preset temperature, as well as to control the flow rates of the first flow control valve 7 and the second flow control valve 14 according to the first temperature, the third temperature, the first preset temperature, and the third preset temperature.

[0055] For example, the second temperature sensor and the third temperature sensor can both be PT100 platinum resistance thermometers.

[0056] For example, the third temperature sensor is installed at the dormitory faucet of the domestic water pipeline 11.

[0057] For example, the second preset temperature and the third preset temperature can be set according to the site conditions and stored in the controller 9 in advance.

[0058] For example, the second preset temperature can be 55°C, and the third preset temperature can be 45°C.

[0059] The control method of the controller is further illustrated below: In the initial state, as described above, the first temperature of the water at the bottom of the packed tower 2 is greater than or equal to 85°C (first preset temperature). The controller 9 controls the first on / off valve 8 to open, the opening degree of the first flow control valve 7 is 50%, and the opening degree of the second flow control valve 14 is 80%. At this time, the circulating pump 5 delivers a portion of the water to the heating network 1 to meet the needs of the heating network 1, and another portion is delivered to the return pipeline 6 and re-enters the packed tower 2 for heating.

[0060] When heating is needed in winter, the second shut-off valve 12 is turned on and the third shut-off valve 13 is turned off. When the second temperature of the water at the inlet of the heating water pipeline 10 is less than 55℃ (the second preset temperature), the controller 9 increases the opening of the first flow control valve 7 (adjusting the opening from 50% to 80%), allowing more water to enter the packing tower 2 for reheating, thereby increasing the temperature of the water output from the packing tower 2, which in turn increases the temperature of the water delivered to the inlet of the heating water pipeline 10, so that the temperature of the water delivered to the inlet of the heating water pipeline 10 can be adjusted to the second preset temperature as soon as possible. When the second temperature of the water at the inlet of the heating water pipeline 10 is greater than or equal to 55℃ (the second preset temperature), the controller 9 reduces the opening of the first flow control valve 7 (from 80% to 50%) and the opening of the second flow control valve 14 (from 80% to 50%) to reduce the amount of steam delivered to the packed tower 2 by the steam pipeline 4, thereby reducing the amount of heat absorbed by the water in the packed tower 2, reducing the water temperature rise, and thus reducing the temperature of the water output from the packed tower 2. This also reduces the temperature of the water delivered to the inlet of the heating water pipeline 10, so that the temperature of the water delivered to the inlet of the heating water pipeline 10 can be adjusted to the second preset temperature as soon as possible.

[0061] When the temperature of the water at the inlet of the heating water pipeline 10 is adjusted to the second preset temperature, the opening of the second flow control valve 14 can be manually adjusted from 50% to 80%.

[0062] When heating is not required, the second shut-off valve 12 is closed and the third shut-off valve 13 is open. When the third temperature of the water at the water terminal of the domestic water pipeline 11 is less than 45℃ (the third preset temperature), the controller 9 increases the opening of the first flow control valve 7 (adjusting the opening from 50% to 80%), allowing more water to enter the packing tower 2 for reheating, thereby increasing the temperature of the water output from the packing tower 2, which in turn increases the temperature of the water delivered to the water terminal of the domestic water pipeline 11, so that the temperature of the water delivered to the water terminal of the domestic water pipeline 11 can be adjusted to the third preset temperature as soon as possible. When the third temperature of the water at the water terminal of the domestic water pipeline 11 is greater than or equal to 45℃ (the second preset temperature), the controller 9 reduces the opening of the first flow control valve 7 (from 80% to 50%) and the opening of the second flow control valve 14 (from 80% to 50%) to reduce the amount of steam delivered to the packed tower 2 by the steam pipeline 4, thereby reducing the amount of heat absorbed by the water in the packed tower 2, reducing the water temperature rise, and thus reducing the temperature of the water output from the packed tower 2. This also reduces the temperature of the water delivered to the water terminal of the domestic water pipeline 11, so that the temperature of the water delivered to the water terminal of the domestic water pipeline 11 can be adjusted to the third preset temperature as soon as possible.

[0063] When the temperature of the water at the water terminal of the domestic water pipeline 11 is adjusted to the third preset temperature, the opening of the second flow control valve 14 can be manually adjusted from 50% to 80%.

[0064] The above settings can maintain a stable temperature of the water supplied from the packed tower 2 to the heat supply network 1.

[0065] In some embodiments, combined with Figure 1 The control components also include a water supply pipe, a water supply valve, and a level sensor. One end of the water supply pipe is connected to an external water supply pipe, and the other end is connected to the inside of the packed tower 2. The water supply valve is installed on the water supply pipe. The level sensor is installed inside the packed tower 2 to detect the real-time water level inside the packed tower 2. The controller 9 is also electrically connected to the water supply valve and the level sensor respectively, and is used to control the opening and closing of the water supply valve according to the real-time water level, a first preset water level, and a second preset water level.

[0066] For example, the external water supply pipeline can be a municipal tap water pipeline. The water supply valve can be a solenoid valve. The level sensor is a submersible level transmitter, which is vertically installed inside the packed tower 2.

[0067] For example, the maximum liquid level inside the packed tower 2 is 1m, the first preset liquid level can be 0.33m, and the second preset liquid level can be 0.67m.

[0068] When the real-time water level inside the packed tower 2 is less than 0.33m, the controller controls the water supply valve to open to supply water to the packed tower 2; when the real-time water level inside the packed tower 2 is greater than 0.67m, the controller controls the water supply valve to close to stop supplying water to the packed tower 2.

[0069] The above settings can detect the real-time water level inside the packed tower 2 and maintain the stability of the water level inside the packed tower 2.

[0070] In some embodiments, a liquid distributor 15 is also provided inside the packed tower 2, and the liquid distributor 15 is located at the top of the packed tower 2; the circulating water return port is connected to the inlet of the liquid distributor 15.

[0071] For example, the liquid distributor 15 is fixed inside the packed tower 2 by bolts.

[0072] With the above settings, the water entering from the circulating water return port can be evenly distributed and flow to the packing layer 3, thereby improving the heat exchange efficiency between the packing layer 3 and the water.

[0073] In some embodiments, a wire mesh mist eliminator 16 is also provided inside the packed tower 2, and the wire mesh mist eliminator 16 is located at the exhaust port at the top of the packed tower 2.

[0074] For example, the wire mesh mist eliminator 16 is fixed inside the packed tower 2 by bolts. The aperture and material of the wire mesh mist eliminator 16 can be set according to the site conditions.

[0075] With the above settings, the mist droplets in the gas flowing out of the exhaust port at the top of the packed tower 2 can be removed by the wire mesh mist eliminator 16, reducing the amount of steam emitted into the outside atmosphere.

[0076] In some embodiments, such as Figure 1 As shown, a drain outlet is provided on the bottom wall of the packed tower 2.

[0077] For example, a manual valve can be installed at the drain outlet, which can be used to open or close the drain outlet.

[0078] With the above settings, when there are many impurities at the bottom of the packed tower 2, they can be discharged through the drain outlet to maintain the cleanliness of the water inside the packed tower 2.

[0079] In some embodiments, combined with Figure 1 The outer wall of the packed tower 2 is provided with a heat insulation layer.

[0080] For example, the insulation layer can be made of rock wool, and the insulation layer is 50 mm thick. The insulation layer is fixed to the outer surface of the packed tower 2 by an adhesive.

[0081] With the above settings, the packed tower 2 can be insulated by the insulation layer, reducing heat loss from the packed tower 2 and improving the efficiency of heat recovery and utilization of steam in the steam pipeline 4.

[0082] In some examples, such as Figure 1 As shown, the steam guide pipe 4 includes multiple connecting pipes, all of which are connected to the inside of the packed tower 2. These multiple pipes can be used to transport steam at different pressures, so that steam at different pressures can be smoothly input into the inside of the packed tower 2.

[0083] In this case, there are also multiple second flow control valves 14, and multiple second flow control valves 14 are set up corresponding to multiple connecting pipes. Multiple second flow control valves 14 can be adjusted synchronously.

[0084] Example 2: This invention also provides an energy-saving plant, wherein the packed tower 2 includes plant equipment, a drain steam pipeline 4, and the drain steam waste heat recovery and utilization device described in Embodiment 1. The drain steam pipeline 4 is installed on the plant equipment and connected to a steam generator for heating the plant equipment with steam.

[0085] For example, the plant equipment may be steam equipment and pipelines, which are prone to accumulating moisture and are at risk of freezing and cracking when the ambient temperature is low.

[0086] The steam generated by the steam generator can heat the plant equipment through the steam pipeline 4, preventing the plant equipment from freezing and cracking.

[0087] The above settings can prevent the factory equipment from freezing and cracking, and the waste heat recovery and utilization device of the drain steam in Example 1 can recover and utilize the heat energy of the steam discharged from the drain steam pipeline 4, thereby reducing heat energy waste.

[0088] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for recovering and utilizing waste heat from a steam-driving system, characterized in that, include: The heat pipe network (1) has a circulating water inlet and a circulating water return outlet; A packed tower (2) is connected in the middle to a steam pipe (4), the top of the packed tower (2) is connected to the circulating water return port, and the bottom of the packed tower (2) is connected to the circulating water inlet, so that the water can circulate between the heat pipe network (1) and the packed tower (2); a packing layer (3) is provided inside the packed tower (2), the packing layer (3) is located between the circulating water return port and the steam pipe (4), so that the steam entering from the steam pipe (4) passes through the packing layer (3) to heat the water entering from the circulating water return port; and, A circulating pump (5) is installed on the pipeline between the bottom of the packed tower (2) and the circulating water inlet, for driving water to circulate between the packed tower (2) and the heat supply network (1).

2. The waste heat recovery and utilization device for the guiding steam according to claim 1, characterized in that, It also includes control components; The control component includes: The return pipeline (6) has its first end connected to the pipeline between the circulating pump (5) and the circulating water inlet, and its second end connected to the upper part of the packing tower (2) and located above the packing layer (3). The first flow control valve (7) is installed on the return pipeline (6); A first temperature sensor is installed at the bottom of the packed tower (2) to detect the first temperature of the water at the bottom of the packed tower (2); The first on / off valve (8) is installed on the pipeline between the first end of the return pipeline (6) and the circulating water inlet; and, The controller (9) is electrically connected to the first temperature sensor, the first flow control valve (7), and the first on / off valve (8) respectively, and is used to control the on / off state of the first on / off valve (8) and the flow rate of the first flow control valve (7) according to the first temperature and the first preset temperature.

3. The waste heat recovery and utilization device for the guided steam according to claim 2, characterized in that, The heating network (1) includes heating water pipelines (10) and domestic water pipelines (11); The inlet of the heating water pipeline (10) and the inlet of the domestic water pipeline (11) converge to form the circulating water inlet; the outlet of the heating water pipeline (10) and the outlet of the domestic water pipeline (11) converge to form the circulating water return outlet. The heating water pipeline (10) is equipped with a second on / off valve (12) and a first check valve, and the domestic water pipeline (11) is equipped with a third on / off valve (13) and a second check valve.

4. The waste heat recovery and utilization device for the guiding steam according to claim 3, characterized in that, The control component also includes: The second temperature sensor is installed at the inlet of the heating water pipeline (10) to detect the second temperature of the water at the inlet of the heating water pipeline (10). A third temperature sensor is installed at the water terminal of the domestic water pipeline (11) to detect the third temperature of the water at the water terminal; and, The second flow control valve (14) is installed on the steam guide pipe (4); The controller (9) is also electrically connected to the second temperature sensor, the third temperature sensor, and the second flow control valve (14) respectively, and is also used to control the flow rate of the first flow control valve (7) and the second flow control valve (14) according to the first temperature, the second temperature, the first preset temperature, and the second preset temperature, and to control the flow rate of the first flow control valve (7) and the second flow control valve (14) according to the first temperature, the third temperature, the first preset temperature, and the third preset temperature.

5. The waste heat recovery and utilization device for the guiding steam according to claim 2, characterized in that, The control component also includes: The water supply pipe is connected to the external water supply pipe at one end and to the inside of the packing tower (2) at the other end. A water supply valve is installed on the water supply pipe; and, A liquid level sensor is installed inside the packed tower (2) to detect the real-time liquid level of the water inside the packed tower (2); The controller (9) is also electrically connected to the water supply valve and the liquid level sensor respectively, and is used to control the opening and closing of the water supply valve according to the real-time liquid level, the first preset liquid level and the second preset liquid level.

6. The waste heat recovery and utilization device for the guiding steam according to claim 1, characterized in that, The packed tower (2) is also equipped with a liquid distributor (15), which is located at the top of the packed tower (2); the circulating water return port is connected to the inlet of the liquid distributor (15).

7. The waste heat recovery and utilization device for the guiding steam according to claim 6, characterized in that, The packed tower (2) is also equipped with a wire mesh mist eliminator (16), which is located at the exhaust port at the top of the packed tower (2).

8. The waste heat recovery and utilization device for the guiding steam according to claim 1, characterized in that, The bottom wall of the packed tower (2) is provided with a drain outlet.

9. The waste heat recovery and utilization device for the guiding steam according to claim 1, characterized in that, The outer wall of the packed tower (2) is provided with a heat insulation layer.

10. An energy-saving factory building, characterized in that, include: Factory buildings and equipment; A steam-cooled pipeline (4) is installed on the plant equipment and connected to a steam generator for heating the plant equipment with steam; and, The waste heat recovery and utilization device for the guiding steam as described in any one of claims 1-9.

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